* Re: Does grub support sw raid1?
2006-03-21 16:53 ` Mike Hardy
@ 2006-03-22 13:28 ` Bill Davidsen
2006-03-23 16:33 ` Herta Van den Eynde
1 sibling, 0 replies; 4+ messages in thread
From: Bill Davidsen @ 2006-03-22 13:28 UTC (permalink / raw)
To: Mike Hardy; +Cc: Herta Van den Eynde, linux-raid, redhat-list
Mike Hardy wrote:
>This works for me, there are several pages out there (I recall using the
>commands from a gentoo one most recently) that show the exact sequence
>of grub things you should do to get grub in the MBR of both disks.
>
>It sounds like your machine may not be set to boot off of anything other
>than that one disk though? Is that maybe a BIOS thing?
>
>I dunno, but I have definitely pulled a primary drive out of the system
>completely and booted off the second one, then had linux come up with
>(correctly) degraded arrays
>
>
Frequently a BIOS will boot a 2nd drive if the first is missing/dead,
but not if it returns bad data (CRC error). A soft fail is not handled
correctly by all BIOS' in use, possibly a majority of them.
>-Mike
>
>Herta Van den Eynde wrote:
>
>
>>(crossposted to linux-raid@vger.kernel.org and redhat-list@redhat.com)
>>(apologies for this, but this should have be operational last week)
>>
>>I installed Red Hat EL AS 4 on a HP Proliant DL380, and configured all
>>system devices in software RAID 1. I added an entry to grub.conf to
>>fallback to the second disk in case the first entry fails. At boottime,
>>booting from hd0 works fine. As does booting from hd1.
>>
>>Until I physically remove hd0 from the system.
>>
>>I tried manually installing grub on hd1,
>>I added hd1 to the device.map and subsequently re-installed grub on it,
>>I remapped hd0 to /dev/cciss/c0d1 and subsequently re-installed grub
>>all to no avail.
>>
>>I previously installed this while the devices were in slots 2 and 3. The
>>system wouldn't even boot then. It looks as though booting from sw
>>RAID1 will only work when there's a valid device in slot 0. Still
>>preferable over hw RAID1, but even better would be if this worked all
>>the way.
>>
>>Is this working for anyone? Any idea what I may have overlooked? Any
>>suggestions on how to debug this?
>>
>>Kind regards,
>>
>>Herta
>>
>>Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>>
--
bill davidsen <davidsen@tmr.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Does grub support sw raid1?
2006-03-21 16:53 ` Mike Hardy
2006-03-22 13:28 ` Bill Davidsen
@ 2006-03-23 16:33 ` Herta Van den Eynde
1 sibling, 0 replies; 4+ messages in thread
From: Herta Van den Eynde @ 2006-03-23 16:33 UTC (permalink / raw)
To: linux-raid, redhat-list
Thanks to all who confirmed that this should work, and gave pointers to
more reading material.
Further investigation proved that the problem is caused by the Smart
Array Controllers that HP uses. As these "Smart" controllers don't
allow for JBOD configs, I had configured each disk as RAID 0 at the
hardware level. When I remove disk 0, the controller detects that it is
not set up for fault tolerance, and fails the logical drive.
As they apparently will only boot from the first logical drive defined,
(which must have been the reason why I couldn't boot when I installed
Red Hat on drives in slots 2 and 3), you now need to go into the Smart
controller configuration utility, and delete the failed logical drive.
My 2nd disk was configured in logical drive 2, which now is at the top
of the list, and therefore can boot just fine.
I'm now struggling with getting the Smart Array controller to recognize
the replacement devive, but that would be a question for an HP/linux
mailing list. I tried registering to
compaqandlinux-subscribe@van-dijk.net, which gets expanded to
compaqandlinux-subscribe@jedi.van-dijk.net, but that comes back with a
"user unknown in local recipient table".
Does anyone know of a good "linux on HP" mailinglist?
Kind regards,
Herta
Mike Hardy wrote:
> This works for me, there are several pages out there (I recall using the
> commands from a gentoo one most recently) that show the exact sequence
> of grub things you should do to get grub in the MBR of both disks.
>
> It sounds like your machine may not be set to boot off of anything other
> than that one disk though? Is that maybe a BIOS thing?
>
> I dunno, but I have definitely pulled a primary drive out of the system
> completely and booted off the second one, then had linux come up with
> (correctly) degraded arrays
>
> -Mike
>
> Herta Van den Eynde wrote:
>
>>(crossposted to linux-raid@vger.kernel.org and redhat-list@redhat.com)
>>(apologies for this, but this should have be operational last week)
>>
>>I installed Red Hat EL AS 4 on a HP Proliant DL380, and configured all
>>system devices in software RAID 1. I added an entry to grub.conf to
>>fallback to the second disk in case the first entry fails. At boottime,
>>booting from hd0 works fine. As does booting from hd1.
>>
>>Until I physically remove hd0 from the system.
>>
>>I tried manually installing grub on hd1,
>>I added hd1 to the device.map and subsequently re-installed grub on it,
>>I remapped hd0 to /dev/cciss/c0d1 and subsequently re-installed grub
>>all to no avail.
>>
>>I previously installed this while the devices were in slots 2 and 3. The
>>system wouldn't even boot then. It looks as though booting from sw
>>RAID1 will only work when there's a valid device in slot 0. Still
>>preferable over hw RAID1, but even better would be if this worked all
>>the way.
>>
>>Is this working for anyone? Any idea what I may have overlooked? Any
>>suggestions on how to debug this?
>>
>>Kind regards,
>>
>>Herta
>>
>>Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>>
>>-
>>To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>>the body of a message to majordomo@vger.kernel.org
>>More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> -
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>
--
Herta Van den Eynde -=- Toledo system management
K.U. Leuven - Ludit -=- phone: +32 (0)16 322 166
-=- 50°51'27" N 004°40'39" E
"Life on Earth may be expensive,
but it comes with a free ride around the Sun."
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
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^ permalink raw reply [flat|nested] 4+ messages in thread